JPH01242276A - Apparatus for preventing lap-feed of continuous paper - Google Patents

Abstract

PURPOSE:To prevent the feed of continuous paper in a lapped state, by arranging a pair of rotary rollers imparting force in the direction reverse to a feed direction to the continuous paper on this side of a paper feed mechanism. CONSTITUTION:Continuous paper 10 is drawn out from a hopper part 12 by a paper feed mechanism 14 to be passed between rotary rollers 16, 18 and guided by a guide 72 to enter the paper feed mechanism 14. Whereupon, the rotary rollers 16, 18 rotating in the direction reverse to the feed direction of the paper 10 impart friction force to the continuous paper 10 in the direction reverse to the feed direction. Therefore, if the continuous paper 10 reaches the rotary rollers 16, 18 in a lapped state, the lapped part is allowed to fall by the friction force of the rotary rollers 16, 18 and only the paper part to which feed force is imparted is passed between the rotary rollers 16, 18. As a result, the lap feed of the continuous paper is eliminated at the part of said rollers and paper jamming, paper cutting or printing inferiority can be prevented.

Description

[Detailed Description of the Invention] [Industrial Application Field 1] The present invention is used for a printing device that uses continuous paper as a printing medium, and is used to prevent continuous paper from being fed in an overlapped manner. This invention relates to a double feed prevention device.

[Prior Art] Conventionally, in this type of printing device, continuous paper to be supplied to a printing mechanism is simply pulled out from a paper supply section by a paper feed mechanism, and even if continuous paper overlaps, it is fed as is. It had become.

[Problems to be Solved by the Invention] In the conventional printing apparatus described above, even if the continuous sheets of paper to be supplied are overlapped, they are fed as they are, so paper jams, paper cuts, etc. may occur in the paper feeding mechanism. Printing defects may occur.

SUMMARY OF THE INVENTION An object of the present invention is to provide a double-feed prevention device that can prevent continuous sheets from being fed in an overlapping manner.

[Means for solving the problem] 'According to the present invention,
The device for preventing double feeding of continuous paper is characterized in that a pair of rotating rollers that apply force to the continuous paper in a direction opposite to the feeding direction are arranged in front of the paper feeding mechanism.

The continuous paper is sandwiched between a pair of rotating rollers and is subjected to a force in the opposite direction to the feeding direction. Therefore, the overlapping portions are eliminated by the rotating rollers. rotating roller,
The reason for placing it in front of the paper feed mechanism is to prevent overlapping continuous sheets from being sent to the paper feed mechanism.

A device for preventing double feeding of continuous paper according to another aspect of the present invention includes: a pair of rotating rollers that are arranged in front of a paper feeding mechanism and apply a force in a direction opposite to the feeding direction to the continuous paper; Opening I Fl! to allow one of the rotating rollers to be pressed against and released from the other! @, a detection means for detecting the presence or absence of continuous paper, and a control means for giving an opening command to the opening v1 side in response to an output signal from the detection means.

In a normal paper feeding state, the pair of rotating rollers are pressed against each other with the continuous paper sandwiched between them. but,
When the continuous paper runs out, it is convenient to open the pair of rotating rollers in order to set a new stack of continuous paper. Therefore, in the present invention, a detection means for detecting the presence or absence of continuous paper is provided, and when the continuous paper is finished, the control means controls the rotary roller to open in response to a signal from the detection means. I'm trying to give orders.

[Example] Next, the present invention will be explained with reference to the drawings.

FIG. 1 is a front view of one embodiment of the present invention. Continuous paper 1
0 is folded at the perforation within the hopper section 12, which is a paper supply section. A paper feed mechanism 14 is arranged above the hopper section 12. A pair of rotating rollers 16 and 18 are arranged in the middle of the paper passage path from the hopper section 12 to the paper feed mechanism 14. These rotating rollers 16,18 rotate in a direction opposite to the direction in which paper 10 is fed. The rotating roller 16 is rotatably attached to a fixed frame (not shown), and a pulley 2 is attached to the rotating roller 16.
0 is fixed. The pulley 20 is connected to a pulley 24 via a belt 22, and the pulley 24 is driven by a first motor (see FIG. 2).

The rotating roller 18 is rotatably attached to the arm 28, and a pulley 30 is fixed to the rotating roller 18. The pulley 30 is connected to a pulley 34 via a belt 32, and the pulley 34 is driven by a second motor (see FIG. 2). Arm 28 is rotatable about shaft 36, which is fixed to a fixed frame. An elongated hole 38 is formed at the end of the arm 28 on the opposite side from the rotating roller 18 . On the other hand, a circular protrusion 42 is provided on one end surface of the gear 40.
is formed. This circular projection 42 is slidably inserted into the elongated hole 38. Gear 40 is rotatable about shaft 44, and shaft 44 is fixed to a fixed frame. The gear 40G meshes with the gear 46, and the gear 46 is the third gear.
It is driven by a motor (see Figure 2).

A paper detection means is installed immediately above the hopper section 12. This paper detection means includes a light emitting section 48 and a light receiving section 50, and when the continuous paper 10 is not present, the light 52 is detected by the light receiving section 50.

FIG. 2 is a control block diagram of this embodiment.

The print controller 54 controls printing and also controls the double feed prevention mechanism according to the present invention. That is, the print controller 5
4 is connected to a double feed prevention controller 56. The output signal of the double feed prevention controller 56 is transmitted to the first motor 58 and the second motor 60.
and third motor 62, and these motors drive pulley 24, pulley 34, and gear 46, respectively. The third motor 62 is a stepping motor and can stop the gear 46 at a predetermined position.

Further, a discriminator 64 for determining the presence or absence of paper is also connected to the print controller 54. A part of the output signal of the discriminator 64 is input to the light emitting section 48, and the detection signal from the light receiving section 50 is returned to the discriminator 64. The discriminator 64 also has an alarm 66
and the double feed prevention controller 56.

The "open 11 BN structure" in the configuration of the present invention is actually composed of the arm 28, the gear 40, the gear 46, and the third motor 62. In addition, in this embodiment, the "1 control means" in the configuration of the present invention is the double feed prevention control device 5.
Consisting of 6.

Next, the operation of this embodiment will be explained. First, a state in which paper is being fed normally will be explained. In FIG. 1, the continuous paper 10 is transferred to the hopper section 12 by the paper feed ti114.
and is sent in the direction of arrows 68° and 70. The continuous paper 10 passes between rotating rollers 16 and 18,
It is guided by a guide 72 and enters the paper feed mechanism 14. The rotating rollers 16 and 18 apply a frictional force to the continuous paper 10 in a direction opposite to the feeding direction. That is, rotating roller 1
6 rotates counterclockwise in FIG. 1, and the rotating roller 18 rotates clockwise. The arm 28 is in the state shown by the solid line in FIG. 1, and the rotating roller 18 is lightly pressed in the direction of the rotating roller 16. In addition, rotation low 516.1
The frictional force caused by the paper feeding mechanism 8 is set smaller than the feeding force caused by the paper feeding mechanism 14.

If the continuous paper sheets 10 overlap, the rotating rollers 16,
When reaching point 18, the overlapping portion is dropped downward due to the frictional force of the rotating roller, and only the portion of the paper to which the feeding force is applied passes through the rotating roller. Therefore, double feeding of the continuous paper 10 is eliminated in this portion.

In the above normal feeding operation, in FIG. 2, the output signal from the double feeding prevention controller 56 causes the first motor 58
and the second motor 60 is rotating.

Further, the third motor, that is, the stepping motor is stopped after the gear 46 is set at a predetermined position. The discriminator 64 constantly sends a signal to the light emitting section 48, and the light emitting section 48 is in a light emitting state.

In FIG. 1, when all of the continuous paper 10 has been sent out from the hopper section 12, light 52 is detected by the light receiving section 50, and this detection signal is input to the discriminator 64 in FIG.

At this point, the discriminator 64 determines the end of the continuous paper 10, and activates the alarm 66, double feed prevention controller 56, and print controller 5.
Send a signal to 4. Then, the alarm device 66 emits an alarm sound (or may turn on an alarm lamp). The double feed prevention controller 56 issues a stop command to the first motor 58 and the second motor 60, and also provides a rotation signal of a predetermined number of pulses to the third motor 62. As a result, the gear 46 rotates counterclockwise by a predetermined angle, and the gear 40 accordingly rotates clockwise by a predetermined angle. Then, due to the engagement between the circular projection 42 and the elongated hole 38, the arm 28 comes to the position shown by the two-dot chain line in FIG. That is, the rotating roller 18
becomes open. On the other hand, the print controller 54 issues a print stop command to the printing device.

Since the operator can hear the end of the continuous paper 10 by the alarm sound, the operator can immediately set a new continuous paper 10. That is, a new bundle of continuous paper 10 is transferred to the hopper section 1.
2, the leading end of the continuous paper 10 is passed between the open rotating rollers 18 and 16, and the continuous paper 10 is set in the paper feeding mechanism 14. Then, a command to resume printing is input to the print controller 54.

Then, a signal is sent from the print controller 54 to the double feed prevention controller 56. In response to this, the double feed prevention controller 56 sends a rotation signal to the first motor 58 and the second motor 60, and also sends a signal of a predetermined number of pulses to the third motor 62. This causes the arm 28 to return to the state shown by the solid line in FIG. Then, the paper is fed normally.

[Effects of the Invention] As explained above, according to one configuration of the present invention, a pair of rotating rollers applies a force in the opposite direction to the feeding direction to the continuous paper, so that the continuous paper does not overlap. The paper is not sent to the paper feed mechanism, which prevents paper jams, paper cuts, and printing defects.

According to another aspect of the present invention, in addition to providing the pair of rotating rollers, one of the pair of rotating rollers is opened to the other at the end of continuous paper, so that a new Continuous paper can be loaded.

[Brief explanation of the drawing]

FIG. 1 is a front view of an embodiment of the present invention; FIG. 2 is a control block diagram of this embodiment. 10...Continuous paper 14...Paper feeder Sugi 16.18...Pair of rotating rollers 2B...Arm 48... Light emitting part 50... Light receiving section 56...Double feed prevention controller

Claims (2)

[Claims] (1) A device for preventing double feeding of continuous paper, in which a pair of rotating rollers that apply a force in the opposite direction to the feeding direction to the continuous paper are placed in front of the paper feeding mechanism. (2) A pair of rotating rollers that are arranged in front of the paper feeding mechanism and apply force to the continuous paper in a direction opposite to the feeding direction; and one of the pair of rotating rollers can be pressed against and released from the other. double feeding of continuous paper, comprising: a release mechanism for controlling the continuous paper; a detection means for detecting the presence or absence of continuous paper; and a control means for giving a release command to the release mechanism in response to an output signal from the detection means. Prevention device.